#include<bits/stdc++.h> using namespace std; double a,b,c,d; int main() { cin>>a>>b>>c>>d; for(double i=-100;i<=100;i+=0.001) if(fabs(a*i*i*i+b*i*i+c*i+d)<0.0001) cout<<fixed<<setprecision(2)<<i<<' '; }